. >> stay with us if you cannot on bbc world news. still to come -- a fifth of the world's plant species are now in danger of disappearing forever. first, she is said to be one of the most photographed people on our planet. a new exhibition of formal photographs document the life of britain's queen elizabeth in pictures. many were taken by her late sister's husband, the photographer lord snowden. >> on her right, mr. anthony armstrong jones. >> he was a society photographer who took pictures of the royals and then became one. tony armstrong jones's wedding to princess margaret was the society event of 1960. although he was not a member of the royal family, lord snowden continued to work as a professional photographer. alongside his documentary work, he was often called on to photograph the queen. many of his photographs have been included in a new exhibition, but the graphic portraits of the queen. here is an image of the monarch and her husband in the kind of formal pose you might expect, and the queen caught by a range of photograph